TM 5-3825-226-24
ENGINE TEST PROCEDURE
LUBRICATION FOR A REBUILT ENGINE
It is very important for a rebuilt engine to have
"adequate" (needed) lubrication during the first seconds
of operation. A "dry start" (without needed lubrication)
on a rebuilt engine can cause bearing damage.
When an engine is rebuilt with new parts, oil is put on
each part as it is installed This is generally enough
lubrication for engine start-up. However, this lubrication
may not be enough or may be lost if the rebuilt engine is
place in storage for any length of time.
When a factory assembled short block assembly is
installed, the oil used at the factory has to give this
needed lubrication. However, the factory oil application
can flow off the parts in a short block during storage or
shipment. As a result the parts in a rebuilt engine will
not have "adequate" lubrication start-up.
To prevent the possibility of a "dry start" and bearing
damage during the first seconds of running, use the
1P540; Flow Checking Tool Group, and Shop air
pressure to pressure lubricate (fill the main oil passage
with oil under pressure) all rebuilt engines.
Procedure for Pressure Lubrication
1.
Clean the tank of the 1P540 Flow Checking Tool
Group
thoroughly,
and
set
the
pressure
regulator to 35 ± 5 psi (240 ± 35 kPa).
WARNING
Air pressure should not be more than
50 psi 345 kPa) at any time.
2.
Put approximately one gallon of engine oil in the
tank.
PRESSURE LUBRICATION
(Using the 1P540 Flow Checking Tool Group)
3.
Connect the tools to the engine as shown. The
tap shown is connected to the main oil passage.
4.
Add air pressure to the tank, with the regulator
set at 35 ± 5 psi (240 ± 35 kPa). Although the
tank does have a hand pump, it is difficult to get
enough air pressure to do the job with the hand
pump.
Therefore,
use
of
shop
air
is
recommended.
5.
Let the one gallon of engine oil flow into the oil
passage under pressure.
When filling the crankcase, put in one gallon of oil
less that the recommendation in TM 53825-226-10, if
engine
has
received
this
pressure
lubrication
application. Also if the engine is not going to be used
for a long time, do the above procedure again before the
first starting.
If shop air is not available for charging the tank, the
hand pump may be used to get the minimum required
pressure.
CAUTION
Do not use the same 1 P540 Flow Checking Tool
Group for both "pressure lubrication application"
and for checking fuel flow. Incorrect cleaning is
probable if the tool is used for both fuel and lube
oil. Even a minute amount of dirt in the fuel system
can cause fuel nozzle failure.
DYNAMOMETER TEST PRECAUTION
To avoid possible engine damage while testing on a
dynamometer, the thermostats must be installed and the
shunt line connected as shown.
SHUNT LINE CONNECTED TO ENGINE
3-391
